A student constructed a model of box type solar cooker. Instead of using glass sheet he used a transparent plastic sheet to cover the open face of the box. He found that this cooker does not function well. What could be the possible drawbacks in his model ? Explain the advantage of painting black the inner and outer surfaces of the cooker and that of cooking vessels

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Solution

Glass sheet is used so as to present the escape of heat from the box (green house effect) . If plastic sheet is used, heat would be lost from the box. Glass traps the heat.
Block surfaces absorb heat radiation.

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Similar questions

Q. Two students made box-type solar cookers separately. They both painted the insulated box with black colour from inside, the cooking pots were painted black from outside, and a plane mirror reflector was also attached. One of the students covered the solar cooker box with a transparent glass sheet but the other student covered the solar cooker box with a transparent plastic sheet. Which of the two solar cookers will be more efficient and why?

In order to make an efficient solar cooker, the cover of cooker box should be made of :
(a) transparent plastic sheet (b) shining aluminium sheet
(c) butter paper sheet (d) transparent glass sheet

Q. A solar cooker may not cook food if

(a) the solar cooker is not placed in the shade
(b) the glass sheet cover of solar cooker is not closed
(c) a convex mirror reflector is not used
(d) the food containers of insulting material are not used

Q. (a) Name that part of a box-type solar cooker which allows the sun's heat rays to enter the box but does not allow inside heat to go out.
(b) Explain why, a plane mirror reflector is used in a box-type solar cooker.

Q. Prateek's mother decided to cook food in a solar cooker. She used a concave mirror while designing the solar cooker. What could be the possible reason for this?

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Glass sheet is used so as to present the escape of heat from the box (green house effect) . If plastic sheet is used, heat would be lost from the box. Glass traps the heat.Block surfaces absorb heat radiation.

Glass sheet is used so as to present the escape of heat from the box (green house effect) . If plastic sheet is used, heat would be lost from the box. Glass traps the heat.
Block surfaces absorb heat radiation.